Preheater



June 16? 19?..5.`

C. A. DARIUS PREHEATER Original Filed Mayl 4, 1922 FIG 2 Y gwvenkofo Patented June 16, 1925i.

UNITED s TATES ,cunetas A. Daems,` or Montanara, new Jnnsny.

Pani-Imran.

Application led Mays, 1922, SerialrN'o. 558,478. Renewed November 8, 1924.

To all whom t may concern:

Be it known that I, CHARLES A. DARIUS, a citizen of the United States of America, residing at .Montclair, in the county of Essex and State of New `Jersey,"have'in vented certain new and useful Improvements in `lreheaters, of which the following is` a specification.

This invention relates to certainnew and useful improvements` in pre-.heaters intended to be secured `in operative position within furnaces orboilers, and which arepreferably mounted upon the feed door to swing therewith, the type of pre-heatersto which the invention relates being of that hind infacturing conditions ,for production in large quantities at a minimum cost V and for `pro-4 ducing a pre-heater'of simpleconstruction as well as of durable form.

With the above` general objects in view and others that will appear as the nature of the invention is [better understood, the same consists of the novel form, combination and arrangement of parts hereinafter more fully described, `shown in the accomf panying' `drawings and claims.

In the drawings, wherein like reference characters designate corresponding throughout the several views, Y Figure 1 is a fragmentary front elevationalview of a furnace with itslair feeding door having a pre-heater attached thereto constructed in accordance `with the present invention7 the pre-heater beingl indicated in `outline by dotted lines, Figure E2 is a vertical section on the line H--II o'f- Figure 1,

Figure Bis` a vertical sectional view of a parts modified form of pre-heater constructed inV accordance with the present invention,

Figure 4 is arear elevational view of the deviceishown attached tothe door of the furnace in Figure 2,

Figure 5 is a side elevational view of. one of the innerkpans of the pre-heater,

Figure 6 is an elevational view ofthe l device shown in 1F igure 5, looking toward 55 the right of the latter ligure, and,

Figure' 7 is an enlarged view of the device shown-in Figure 5 anddrawn in vertical section. y Y

Referring in detail to the several views, the furnacewall 5 )has a door 6 hinged thereto as at 7 along one side'of` an opening provided insaid wall and this door is provided with the usual slots for admitting air into the combustion chamber of the furnace, the amount of air being controlled by a sliding damper 8 or the like. 1

"The present invention is adapted to be attached to the inner surface of thedoor 6 and alined with the openings of said door 70 so `as to project inwardly of the furnace, and in the formfshown-in Figures 1 `and 2, Vthe device embodies a Vpair. of metal pans 9 and lOwhich `are nested in reverse position and which are preferably constructed ofsheetmetal similar tothe'structure of ordinary bake pans wherein kall of the side walls of each pan converge in the same directicn. As is wellLlmown, these pansare open at the top and provided with a bottom wall and the outerpan 9 may be sus- .pended by means of suitable'ho'ols 11 attached to the upper wall thereof and engagedin suitable eye members 12 lined to the upperpart of the door 6, thepansfthen swinging andremaining in contact with the i inner face of thedoer through gravity andV being readily detachable but obviously `any other manne1 of mounting the pans 9 and 10 upon the door 6 may be employed. In 90 accordance withthe present invention, the inner pan 10 is perforated as at 13 in one or more of its side walls while the bottom wall of the same is imperforate and preferably conca-ved inwardly so that the air may pass readily to the space between the sides of the two pans. The sides of the outer pan 9 are imperforate and thebottom wall thereof is perforated as at 14, the preferred construction being the provision of .relaico tively larger and a smaller number of perforations or openings inthe pan 10 than in the pan 9, thus effecting a more thorough bafliing of the air before it passes out of the perforations 14 to the combustion chamber. lt will be noted that the perforations lll in thepan 9 are relatively small in size and largely increased in number with respect to the openings 13 in the pan l0, and substantially extend over the entire bottom wall of the pan 9. By the provision of a large number of very small perforations in the pan 9 so located as the inlet for the preheated air, a multiplicity of very fine jets of air are fed into the combustion chamber above the lire for mixture with the gases therein, increasing combustion and insuring the maximum consumption of the fuel. The fine jets of air thoroughly coiningle with the combustible furnace gases and are drawn through the preheater, any blowing action thereof1 from a point exteriorly of the feed door being prevented by an effective baflle of the air caused by the reduction of size of the perforations in the direction of travel of the air as well as the tortuous path thereof. The preheated air supply is thus very finely subdivided on the similar principle as is involved in the airfeed of an internal combustion engine, where the air is substantially atomized.

Obviously, the bottom of the inner pan l0 .may also be perforated if found desirable as indicated at 13 vith respect to the modified form of this pan shown at l0 in Figure 7. @therwise the construction of the pan in Figure 7 is the saine as in Figure 2.

i-is shown in Figure 3, the device may be indefinitely extended inwardly by the additional association of nested pans, although there should not be such number of pans associated will not swing clear of the furnace door opening when said door is opened. In Figure 3 another unit is added comprising reversely disposed and nest-ed pans 9l and 19L respectively, similar to the pans 9 and l() and with the pan 9a tightly tting over the bottom ef the pan 9 and frictionally retained in place or otherwise as found desirable. rlhe pans 9a and 10a are otherwise of the same construction as the pans 9 and 10 except that the same are made smaller with the pan 10 of shallower form than the pan 9a so that the pans 9 and 9u may be nested to a slight extent before the bottom of the pan 10a contacts with the bottom of the pan 9.

lli operation the desired amount of air will be allowed to flow through the openings or slots by regulation of the damper plate S and this air will pass to the sgace between the side walls of the pans 9 and l0 or a part of the same will pass through the perferatiens in the bottom of the pan 19 when the latter is employed. The air will pass through the perforations in the side of the pan i0 to the interior of the latter and then outwardly through the perfor-ations ll of the pan 9. Due to the tortuous path of travel of the air and the difference in size and number of the perforations provided in the two pans, a very ei'iicient baffling action is had whereby the heat of the walls of the pan members will be radiated to the air and the latter effectively pre-heated before discharge into the combustion chamber of the furnace. As shown in Figure Il, the openings 14e, in the bottom wall of the outer pan 9, are also smaller in area than the intervening unperforated spaces between them, thereby affording effectual means for .still further raising the temperature of the already preheated aii, before and as it is drawn into the combustion chamber, by intimate contact with the hot metal of the bottom of the outer pan, to a degree more nearly approximating that obtaining within the combustion chamber itself.

From the foregoing description, it is believed that the construction and operation. as well as the manner of use of the present device will be readily apparent and it will be seen that the invention provides a simple and efficient construction capable of be ing manufactured at a low cost in large quantities and readily installed for use.

Having thus described the invention, what l claim as new is ll. An air pre-heater attachment for furnace doors embodying reversely disposed and nested metal pan member-s perforated to provide a tortuous path of air from the open end of the outer pan through the bottom of the latter and through walls of the inner pan, and means to attach the device to a furnace door with the open end of the outer pan contiguous with the inner surface of said door.

2. An air pre-heater attachment for furnace doors embodying reversely disposed and nested metal pan members perforated to provide a circuitous path of air from the open end of the outer pan through the bottom of the latter and through walls of the inner pan, and means to attach the device to a furnace door with the open end of the outer pan contiguous with the inner surface of said door, said pans having side walls all converged in the same direction with relation to their open ends.

3. An air pre-lieater attachment for furnace doors einl'rodying reve-rsely disposed and nested metal pan members perforated to provide circuitous path of air from the open end of the outer pan through the bottom of the latter and through walls of the inner pan, and means to attach the device to a furnace door with the open end of the outer pan contiguous with the inner surface of said door, said pans having side walls all converged in the same direction with relation to their open ends, and the inner wall igfaiaeao or bottom Wall 'of the innorfpan being-inwardly conca-ved.

4. rinrlair .pre-heater attachment for furnacedoors embodying reverselydisposed and nested metal pan members :perforated to provide a tortuous path of airfromi the open end of the outer pan through the bottom of the latter and through Walls of the inner pan and moans to attach the device to a furnace door With the open end of the outer pan contiguous with the inner surface of said door, the inner pan having perforations in the side Walls thereof and the outer pan having imperforate side Walls and perforations in the bottom Wall thereof, the lirst named perforations being larger and fewer in number than the latter perforations.

5. An air pre-heater attachment for furnace doors embodying reversely disposed and nested sheet metal pan members perforated to provide a circuitous path of air from the open end of the outer pan through the bottom of the latter and through Walls of the inner pan, and means to removably attach the device to a furnace door With the open end of the outer pan contiguous with the inner surface of said door.

G. An air pre-heater for furnace doors comprising a plurality of baffling units each embodying reversely disposed nested pans with the Walls of each pan all converging in the same direction and With the Walls of the inner pan sloping in the different direction to the Walls of the outer pan, said nf'alls of the inner pan being perforated and said Walls of the outer pan being imperferate with the bottom Wall of the outer pan perforated, and means to attach the outer pan of the unit nearest the furnace door to the latter, said outer pan of the first unit having the outer pan of the next unit telescoped onto the same.

7. An air pre-heater attachment for furnace doors comprising air-baffling members consisting of reversely disposed nested pans with the Walls of the inner pan sloping in a different direction from the slope of the Walls of the outer pan so as to form an air space between the inner and outer Walls, said Walls of the inner pan being perforated and said Walls of the outer pan` being imperforate with the bottom of the outer pan perforated.

8. An air pre-heater attachment for furnace doors comprising air-baffling members consisting of reversely disposed nested pans with the Walls of the inner pan sloping in a different direction from the slope of the Walls of the outer pan so as to form an air space between the inner and outer Walls, said Walls of the inner pan being perforated and said Walls of the outer pan being imperforate with the bottom of the outer pan perforated, and With the said perforations in the walls of the inner pan larger and "fewer in number than thosein the bottom of the outer pan.

-9. Aun-:air preheater-for. furnaces and boilers` comprising aplurality ofbafl'l'ling members consisting of reversely disposed nested pans,Wit-h the Walls of the inner pan sloping inra different `direction tothe walls ofthe outer pan,said walls of the inner pan being perforated and said Walls of the outer pan being imperforate, and with bottom Wall of the outer pan perforated.

l0. An air preheater for a furnace or boiler consisting of reversely nested inner and outer pans, so perforated and disposed as to permit the passage of air from Without the furnace, into and between the Walls of the inner and outer pans, into the inner pan, through perforations of the inner pan, and thenceV into the combustion chamber through perforations in the bottom of the outer pan. Y Y

ll. An air preheater for a furnace or boiler consisting of reversely nested inner and outer pans, so perforatedv and disposed as to permit the passage of air from Witlr out the furnace, into and between the Walls of the inner and outer pans, into the inner pan, through perforations of the inner pan, thence into theV combustion chamber through perforations in the bottom ofthe outer pan, with the perforations so disposed that the same will be larger and relatively fewer innumber at the near end and smaller and relatively greater in number toward the far end.

12. An air preheater for furnaces or boilers `consisting of reversely nested perforated baiiing pans, with the open end of the inner panV contiguous with the bottom Wall of the outer pan, and having their side Walls assuming a different direction. so as to form Wedge-shaped air-spacing between related side Walls of the inner and outer pans.

13. An air preheater consisting ofV reversely nested perforated pans, the perforations being of different sizes and differing Yin number in successive baffling parts there-- la. An air preheater for furnaces comprising a plurality of reversely disposed nested pans, with the side Walls of the pans sloping in opposite directions, and said pans being perforated in a manner to cause air in passing therethrough to be baffled and preheated, and issue in a multiplicity of very fine spray jets over the fire to mingle with the furnace gases Within the combustion chamber. Y

l5. An air preheaterfor furnaces comprising reversely nested pans,rsaid pans being perforated in a manner to cause air in passing therethrough to be baffled and preheated, and issue in a multiplicity of very fine .spray` jets over the fire to mingle with the furnace gases Within the combustion chamber'.

16. An air-preheater of the kind described comprising reversely nested pans, with the side Walls of the pans thus nested having a different direction s0 as to form an angular air space between them, the side Walls of the inner space beingl perforated and the bottom Wall of the outer pan being perforated with its sides imperforate, with the area of the openings in said bot tom Wall substantially less than the area of the intervening spaces.

In testimony Whereoil I affix my signature.

CHARLES A. DAR US. 

